try to build with correct ffcall/ffi depending on target system

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@26483 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,8 @@
+2008-05-01  Richard Frith-Macdonald <rfm@gnu.org>
+
+	* configure.ac: try to use libffi on sparc64 as libffcall does not
+	work.  Warn if user tries to enable libffcall.
+
 2008-04-25  Richard Frith-Macdonald <rfm@gnu.org>
 
 	* Source/NSPropertyList.m:

Source/NSNotificationCenter.m

@@ -135,6 +135,9 @@ struct	NCTbl;		/* Notification Center Table structure	*/
  * each -addObserver... request.  It holds the requested selector,
  * name and object.  Each struct is placed in one LinkedList,
  * as keyed by the NAME/OBJECT parameters.
+ * If 'next' is 0 then the observation is unused (ie it has been
+ * removed from, or not yet added to  any list).  The end of a
+ * list is marked by 'next' being set to 'ENDOBS'.
  */
 
 typedef	struct	Obs {

configure

@@ -16099,9 +16099,21 @@ fi
 
 #--------------------------------------------------------------------
 # Check for FFI interface libraries for invocations
-# We enable ffcall by default now.
+# We enable ffcall by default now, except on sparc64 (where we think
+# it's broken).
 #--------------------------------------------------------------------
-do_enable_libffi=no
+case "$target_cpu" in
+  sparc64*)
+    do_broken_libffi=no;
+    do_broken_libffcall=yes;
+    do_enable_libffi=yes;
+    do_enable_libffcall=no;;
+  *)
+    do_broken_libffi=no;
+    do_broken_libffcall=no;
+    do_enable_libffi=no;
+    do_enable_libffcall=yes;;
+esac
 
 # Check whether --enable-libffi was given.
 if test "${enable_libffi+set}" = set; then
@@ -16115,7 +16127,7 @@ fi
 if test "${enable_ffcall+set}" = set; then
   enableval=$enable_ffcall;
 else
-  enable_ffcall=yes
+  enable_ffcall=$do_enable_libffcall
 fi
 
 
@@ -16588,6 +16600,10 @@ rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
     { echo "$as_me:$LINENO: result: libffi" >&5
 echo "${ECHO_T}libffi" >&6; }
   fi
+  if test $do_broken_libffi = yes; then
+    { echo "$as_me:$LINENO: WARNING: ffi may be broken on this system ... try enabling ffcall" >&5
+echo "$as_me: WARNING: ffi may be broken on this system ... try enabling ffcall" >&2;}
+  fi
 elif test $enable_ffcall = yes; then
 
 cat >>confdefs.h <<\_ACEOF
@@ -16643,6 +16659,10 @@ rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
     { echo "$as_me:$LINENO: result: ffcall" >&5
 echo "${ECHO_T}ffcall" >&6; }
   fi
+  if test $do_broken_libffcall = yes; then
+    { echo "$as_me:$LINENO: WARNING: ffcall may be broken on this system ... try enabling ffi" >&5
+echo "$as_me: WARNING: ffcall may be broken on this system ... try enabling ffi" >&2;}
+  fi
 else
   ffi_ok=no
 fi

configure.ac

@@ -1868,9 +1868,21 @@ fi
 
 #--------------------------------------------------------------------
 # Check for FFI interface libraries for invocations
-# We enable ffcall by default now.
+# We enable ffcall by default now, except on sparc64 (where we think
+# it's broken).
 #--------------------------------------------------------------------
-do_enable_libffi=no
+case "$target_cpu" in
+  sparc64*)
+    do_broken_libffi=no;
+    do_broken_libffcall=yes;
+    do_enable_libffi=yes;
+    do_enable_libffcall=no;;
+  *)
+    do_broken_libffi=no;
+    do_broken_libffcall=no;
+    do_enable_libffi=no;
+    do_enable_libffcall=yes;;
+esac
 
 AC_ARG_ENABLE(libffi,
   [  --enable-libffi  		Enable use of libffi library],,
@@ -1878,7 +1890,7 @@ AC_ARG_ENABLE(libffi,
 
 AC_ARG_ENABLE(ffcall,
   [  --enable-ffcall  		Enable use of ffcall library],,
-  enable_ffcall=yes)
+  enable_ffcall=$do_enable_libffcall)
 
 AC_ARG_ENABLE(do,
   [  --disable-do			Compile even if DO-dependencies are not met],,
@@ -1948,6 +1960,9 @@ if test $enable_libffi = yes; then
   if test $ffi_ok = yes; then
     AC_MSG_RESULT(libffi)
   fi
+  if test $do_broken_libffi = yes; then
+    AC_MSG_WARN([ffi may be broken on this system ... try enabling ffcall])
+  fi
 elif test $enable_ffcall = yes; then
   AC_DEFINE(USE_FFCALL,1,
             [Define if using the ffcall library for invocations])
@@ -1957,6 +1972,9 @@ elif test $enable_ffcall = yes; then
   if test $ffi_ok = yes; then
     AC_MSG_RESULT(ffcall)
   fi
+  if test $do_broken_libffcall = yes; then
+    AC_MSG_WARN([ffcall may be broken on this system ... try enabling ffi])
+  fi
 else
   ffi_ok=no
 fi